I never wash anything but flannel. NEVER EVER wash pre cuts.I prefer working with unwashed fabric. I do however iron before cutting. Whether washed or unwashed once the blocks are sewn together and washed it will be fine. I use color catchers on any quilt that has dark colors on the first wash. I personally prefer the soft comfy feel of a quilt once it is washed, than a stiff starched feeling one. Who the heck would want to cuddle up with something like that? lol